An unhandled rejection triggered , when kafka-node can not connect to the broker.

[yunnysunny]

Bug Report

We use kafka.KafkaClient to init a client, and listen the event of error to catch the error of the client. But something may not pass to the event of error, but just triggered in the internal code directly.

You have triggered an unhandledRejection, you may have forgotten to catch a Promise rejection:
Error: connect EHOSTUNREACH xx.xx.xx.xx:9092
    at Object.exports._errnoException (util.js:1018:11)
    at exports._exceptionWithHostPort (util.js:1041:20)
    at TCPConnectWrap.afterConnect [as oncomplete] (net.js:1086:14)